use canonical module subfolder tree

src/browser/main/tab/page/navigation/history/mod.rs

@@ -0,0 +1,20 @@
+mod back;
+mod forward;
+
+use gtk::prelude::BoxExt;
+use gtk::Box;
+
+pub fn new() -> Box {
+    let history = Box::builder()
+        .orientation(gtk::Orientation::Horizontal)
+        .css_classes([
+            "linked", // merge childs
+        ])
+        .build();
+
+    // Compose childs
+    history.append(&back::new());
+    history.append(&forward::new());
+
+    history
+}